.loading {
  display: flex;
  justify-content: center;
  align-items: center;
  color: white;
  font-size: 3em;
  text-transform: uppercase;
}
.loading span {
  margin-top:10px;
  padding: 0 20px;
  line-height: 100px;
  background: #1C1C1C;
  animation: bulge 2s infinite;
}

@keyframes bulge {
  50% {
    box-shadow: 0 20px 0 #eee;
    transform: translateY(-35px);
  }
}